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pierre.

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  1. Hi @perg67, which USB to serial adapter are you using? I think normal serial is 12V while others are 3.3V: https://electronics.stackexchange.com/questions/274287/what-is-the-difference-between-rs-232-and-ttl-uart
  2. What information is inport for you to see across all sites? What price site is acceptable?
  3. Thank you for sharing your results. Although I can see the inverters is having a hard time handling that specific problem scenario, my problem is fixed because the output voltage remain stable. I've created my own software that I will probably make available for free. It runs an embedded grafana which is what you see in the screenshots. It runs on a Pi and in future I will probably have a closed beta if you are interested.
  4. @Blowdart18 This table from geyserwise is pretty good as a reference for how much difference there is between the months. Don't mind what the actual value is in this table, just calculate the percentage relative to the best summer month, then do the math to predict what you will get in that month based on what you currently get. https://www.geyserwise.com/wp-content/uploads/2016/03/0207_PV-system-installation-manual_web.2016March09.pdf
  5. @Jaco P Bloem I have 9x 340W in serie per inverter. My PV voltage generally goes between 310V and 390V. What do you have? Feedback in terms of the upgrade: I can confirm that my problem has 90% been solved at the cost of 5% less PV generation. As far as I can tell the inverter now tries to squeze out less power from the panels, but is much more stable. The PV voltage doesn't have sudden drops and my AC out doesn't drop below 220V, where it previously dropped to 190V. There is another forum topic where a user also reported less PV generation when upgrading from 71.70 to 71.80. I've upg
  6. Yes it's the 450V models. I upgraded them a few hours ago so I don't know how they perform yet. I'm hoping it solves this issue.
  7. I just upgraded my MKS II (yes the 450V MPPT) to 71.82. I wouldn't upgrade unless you have an issue. If you do have an issue, the supplier/installer should give you the latest firmware and provide support if something goes wrong. In my case my installer came to my house and did the upgrade with me. It's not that it's hard to do, but if something goes wrong it should be fixed as part of warranty. That is just my opinion and perhaps not industry tendency.
  8. I've flashed my 2x Axpert MKS II inverters with the latest firmware (71.82). I've attached the firmware to this post for interest sake. Whatever you do with it is at your own risk. I used this cable and it worked the first time on both. Note this cable goes from your computer to the serial cable that came with the inverter (see picture): https://www.takealot.com/ce-link-usb-2-0-to-rs232-db9-serial-male-a-2m-cable/PLID51855970 The inverters remained connected via parallel cable during upgrade. I turned one on and the other off, which sets the one turned on to master. I then flashe
  9. I haven't read through this entire forum topic, but note other users reported Axpert king solar PV production issues were fixed with firmware upgrade:
  10. @JacquesVDM Whats your plans for this project? Is it just for your own use or do you plan to make it available?
  11. Hi @Coulomb what is an undersized battery? I know the MKS II 48V manual says you need 200AH battery per inverter, but that is for lead acid right? With lithium the charge/discharge is much higher. I currently have 3x PylonTech US3000 which comes down to 220AH. I haven't sorted out the fluctuating output AC yet. I've replaced the parallel cables and made sure all cables are same length. In charts below, problem happens around 09:25 and again at 09:51. Note that I can easily cause the system to become unstable by just turning on enough appliances to match (but not exceed) the PV generat
  12. Agreed, but typically you would switch back to battery far below this level, probably 50% or 60% SOC. Agreed, but I doubt users care about which component calculates the SOC, just as long as it's there and working. Theoretically the PylonTech BMS should be the best at calculating their own SOC, so in that regard the "interim" solution might actually perform better. And for lead acid batteries: I would only install these in a new system if there are severe budget constraints. I imagine if you are forking out money for a Victron you don't even consider lead acid. What is the d
  13. I recently saw this video on youtube which I don't agree with. I'm going to post it here so that it can be debated in public. 1) Incorrect: The Axpert inverter can only use battery voltage, not state of charge (SOC). The battery in the video looks like a PylonTech lithium battery. Historically Axperts couldn't read the SOC, but this has been added, example: https://www.enway.co.za/axpert-pylontech-communication-cable-rj45-rs485-bms 2) The whole premise of the video seems to be that with the Axpert you need a separate grid tie inverter to have a proper setup. This logic is flawed, t
  14. @Wilfred I run the same setup as you do (2x MKS II with Pylontechs and ICC), but I'm facing an issue that I want to determine if it's just me or if everyone has the problem they just don't realize it. It would really help if you can answer these two questions for me: 1) When running on solar/battery, do you ever see your inverter output voltage dip to below 220V or 210V? When my PV generation is the same as the load, meaning battery watts is 0 my output voltage starts to fluctuate between 200V and 235V. Video here. 2) What is your PV volts? I run 9x 340W panels in one string per inverter
  15. I monitor both my Axpert MKS II inverters with ICC. The cable goes into either one and "axpert parallel" is selected in ICC. Then it shows both. In terms of different loads: this doesn't solve any problems, but just for further insight: with PV turned of or at night, let it run from grid and check what the load watts on each inverter. It should be very similar as the power is just flowing through from the grid. If it's not the same, your AC cable lengths may be different. The breakers could have different internal resistance. Your neutrals might be connected together before the neutra
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